The Grayer His Hair, the Higher His Heart Risk? - WebMD, 4/10/17 -
"graying hair may also go hand-in-hand with
unhealthy "biological aging," since both unfold along similar lines ... The
upshot, he said, is that while graying hair may turn out to be an indicator
of risk, most of the focus to date has stayed centered around clearly
"modifiable" risk factors, meaning behaviors that patients can change. Those
include shedding weight, quitting smoking, and taking steps to reduce high
blood pressure and cholesterol"

Gray
hair and vitiligo reversed at the root - Science Daily, 5/3/13 -
"people who are going gray develop massive oxidative
stress via accumulation of hydrogen peroxide in the hair follicle, which
causes our hair to bleach itself from the inside out, and most importantly,
the report shows that this massive accumulation of hydrogen peroxide can be
remedied with a proprietary treatment developed by the researchers described
as a topical, UVB-activated compound called PC-KUS (a modified
pseudocatalase). What's more, the study also shows that the same treatment
works for the skin condition, vitiligo"